trans-1,2-Dichloroethylene
Clearwater
1,2-Dichloroethylene, a neurotoxic solvent, exists in two different forms: trans-1,2-dichloroethylene and cis-1,2-dichloroethylene. A mixture of the two forms is used to manufacture other solvents and chemical products.
Samples
Samples exceeding legal limit (MCL)
Samples exceeding
health guidelines
Testing results - average by year
| Year | Average result | Samples taken | Detections | Range of results |
|---|---|---|---|---|
| 2014 | 0.210 ppb | 1 | 1 | 0.210 ppb |
| 2015 | 0.0867 ppb | 3 | 1 | ND - 0.260 ppb |
| 2016 | ND | 3 | 0 | ND |
| 2017 | ND | 1 | 0 | ND |
| 2018 | 0.0550 ppb | 2 | 1 | ND - 0.110 ppb |
| 2019 | 0.220 ppb | 1 | 1 | 0.220 ppb |
ppb = parts per billion
State and national drinking water standards and health guidelines
EWG Health Guideline 60 ppb
The EWG Health Guideline of 60 ppb for trans-1,2-dichloroethylene was defined by the California Office of Environmental Health Hazard Assessment as a public health goal, the level of a drinking water contaminant that does not pose a significant health risk. This health guideline protects against harm to internal organs.
EPA Maximum Contaminant
Level (MCL) 100 ppb
The legal limit for trans-1,2-dichloroethylene, established in 1991, was based on a toxicity study in laboratory animals conducted in the 1980s.
ppb = parts per billion
All test results
| Date | Lab ID | Result |
|---|---|---|
| 2014-06-17 | 14F1226-01 | 0.210 ppb |
| 2015-08-04 | 15H0116-01 | ND |
| 2015-08-04 | 15H0116-02 | ND |
| 2015-08-04 | 15H0120-01 | 0.260 ppb |
| 2016-04-21 | 3435234 | ND |
| 2016-04-21 | 3435258 | ND |
| 2016-04-21 | 3435266 | ND |
| 2017-02-27 | 17B1349-01 | ND |
| 2018-03-20 | 18C0824-02 | ND |
| 2018-03-20 | 18C0827-01 | 0.110 ppb |
| 2019-12-03 | 19L0090-01 | 0.220 ppb |